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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a71b756b6e12f1c1fdaa531cecb0a70cd54196f50b90ba69b7db48db3c9665a' 
  AND token = 'Pc5L7c5o/40MbUN7D4Ysux4Y35OSb9wUXVqwtjz0q08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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