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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f554cc6bb76c9bced4e544b087c7a0c9656e4d0ae2fd0ccfa9d817d1e9883f11' 
  AND token = '8pk8UJp5KGGaXA78F4+pFXprRjnA6jb7bNGg4CIqQrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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