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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814ee4fda366d91648f87213d0f0dadfd3c3d4c5a3e6a369839ea7209286b0c2' 
  AND token = 'ycpEBtZiOaIcDuvlfQHqjWeU2jKxIDPGGI3b+CIJA+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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