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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b8d9a5f3ef3b988a6ce6e151ffac355a5c78e5587983bc77cf8c37a7f6c87e' 
  AND token = 'faXlPF4TlH5VfhJzExdrHiQ47ZVs8TYI8V8kzSH3Ut0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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