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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a34fa73ae94df1f8ccc0ef18373aff2d6debc3ffd4662634b54be72e988aed' 
  AND token = 'fd0Dy/OQ7wyi7jsnOC/1Tto88vkbUOCWd3QJkZXbnrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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