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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdee87a354a1cef8133c3a264a2e3010e037fc4f20d82878cfbbcae7370d0d1' 
  AND token = 'xUERDoOIMizcAgfSMgkOIZkUTmX+i1ntCO8keth5d/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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