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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874bded36195c494c09079d918728ce47d1c9b0dc93db512ad7a2fd74afd373f' 
  AND token = 'yed9Cj0jwVE4ECqw7wJfT1pv3NeT4pDWo85MMSov2HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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