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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0623c3aae8cbdea2a0a9c0cfa5c882e41091e3ac3eabf694c36ca2fdcd73ca19' 
  AND token = '+0cvNXJQ2WM/f+eKkhK+dgcYWKzwYg1HUz2QCQVYCB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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