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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b6c71c08e737ab5de988913d7f63c44f65ec1c200921c782a52220254336cc' 
  AND token = 'Bb7Q4c4+8UnsM/P/DRPZxZ4qZS5dDyvrREs8vsCOtDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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