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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17734ff239df060d3cffe102b8af2d2f63a423d4898092177a11e9903d445a1c' 
  AND token = 'tOF7nZlTLipFWCZWQcun9Wl3JZ89qLxLQGRA3f7YMKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}