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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0aa7ce317c843bd916d6cdab0167fe674dd9cb55b12433e24cf715cf304daa' 
  AND token = 'hk4LysRb5qkD72jiKpJ+M8F14o++3FQTUytiP8dhVGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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