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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d87614127eeaf84bced7c63ff6e1a3fdbbe22f7799729c94f2a834a3895cd8' 
  AND token = 'eagQF6T3B6DjCxLc8Obs23Yap13kYWUR1BduO5qJ1u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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