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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76f849b034b821e8c1003c7785c1ffb2bc9a14e7576efccfed1adfb014d2884' 
  AND token = 'miSboQ1fs5TgIjh4glvgn6JWgGLH2QsA9Hjo13Lxq2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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