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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09831c83608300b2c6211608e51008b658c0b6909f1028910c727d43b194f295' 
  AND token = 'wFsbXMydilctc5aKlLDTLo99DdoOmZpX4dLS/2cF4Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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