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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc26c656e599e634dac516fefe01265cbed906ef3706ce63f793d20fddcffd3b' 
  AND token = 'QwPXCDymYXnYfu9GFhnPsQB2UFM1gG2xby3a1dm3W+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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