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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e626766a4deba2f1bea4a0d03e3ce6230b788e54b4b650fdf133c45a3fc470d4' 
  AND token = 'urFLxamfI4WmpJpy+wjMFH27bac0oH6+1i5fNkdQobY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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