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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c754713e24737d694e48f4ba31842bead1c492e7a2b0f1791c66118d553aa56' 
  AND token = 'PR01J+qjsjPQBbng5PKDwbie6EUR7giBGJw01Aj/O30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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