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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acce69c1323eb0909d06d4aede2d852083c1ab2954ca6ee3e710d00f561bdce1' 
  AND token = 'jHIjSAXFvagOMCoOPmgkx4D9DRSpIoPI+B3Izh+PsuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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