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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef876d4236272c531f2147d72917cf3b60d1b765d68ec332a45e1c05e6e22d27' 
  AND token = 'gqXxA8qRst2m/n+8b9CvmC8adlICMKY7zHiNvW7GOkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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