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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38837c4dc454b6f5be7a3fe9802cd053fbd7946c869904ef83909f6b94379b0c' 
  AND token = '6TfooPyN3R4nThLRW6tDbRkk8p7XXlYZnTLq/M1BX1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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