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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f87c89980e28ef29721d0f66cd1741d69aa7932d5ca6a26e84ac27e4387e551' 
  AND token = 'vCrSdHkzkylXxff7dnLgjB3f7V6LCV7+YWU8THb/8A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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