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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d9544d6919589802f813bc4142a27b631c9c4ad70b316667c0f5901475fdcb' 
  AND token = 'L4bdmLim2RYXaiE6ll/ivIVZeGf2sYwV91IEjtlchv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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