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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28bff75b45798d303ab1939954ea2c036d0ba2085eff85c33e9257621c6793a' 
  AND token = 'Z3ZFwO0HDwf13yrfV40j8rwaQ5ciNzg/1oxoN1JkKOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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