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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ac3f07637ee98b45f674b2259575cf10d22b5b9c03ec8b8ec08d73a2ee3a33' 
  AND token = 'Wzq5doMQKPt3ZHccUgn52Z+UDSiADUdcWzl430EKZds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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