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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b77c7c9249286d03cca984fb57e7618fee323d8deef56ce7e176268af1ad13' 
  AND token = 'RPbrwUHVXE5XiGt9V3xleMQUIkVKDmgVLLQgH2dKjV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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