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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e612e5b5bf3585415a5e21721dd1512cadf1c0e381ad641b897829ec220ec82' 
  AND token = 'LMAj0hvpshHHq0po4cOyLUF/iNJoHxQ+sme0PWP3OKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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