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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbc796730cd8455e9a210bfad4b294a691fbc3855ef26325f8f1305f81f94d2' 
  AND token = 'X9Rd0YGHvOtGvNklB72d+WC02zG4uqS/RzCwlb0kXko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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