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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938e2d626b875487f7930d6bcf0a136a73dc4dd7ef64d27eae499aa3beadccf4' 
  AND token = '8UH1RkV9Eb/XFhOi45eLnGKDZOnXYywqcakyChl748o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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