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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2584abdf6d4fcfae454d84485ce2405f4a4fb3539ca896ce829c0b23b1f34a' 
  AND token = 'gTIyXOwkQaV8XRqjifYGdIwLhGxC7Skt7bzB8faZJhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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