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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4393128f0d63331773e093af81bcc6dd8c5e51c369943e999499c380dba72a5' 
  AND token = 'LVw5B/f+5PuZGeTPCnCMLuQq5VNuG64Se9BqTIP08mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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