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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713b4c3e5af60f60b141446710f06acd093103b7fcdc7724a11dc9df84aa0c89' 
  AND token = 'uio20ASldGrdcGJ+wUUTJevkn+M5XMjXv8no2iAvhdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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