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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b31dc75a402cf12cb6a5c9db54c2a9c629e87f9732af33b044bcec3ae27a9e' 
  AND token = 'nnk/Rn+8Eqf1GxjHQ8Bid/JE5ZLn4WQcuRcsOuD6L+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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