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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c0bff214bba7fcb1144bf7b7fe912e07164395ee5ffa3dc9354888115efda5' 
  AND token = '7SXb9yez4Sp4zN1g6pqWnl54faDAOUE04HS8qSCAJPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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