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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ead66835e0d734f1401efa6fe0143879a7cc5f8dab54496b142626722046f9' 
  AND token = 'A4qDy/1dG8Cy7a2IYuu/J4qMxZ+pWC12/5D6lvnSAOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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