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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcfe814b2a1063519d22485af7254df7c353eb32cc8b7e36ae1a303c5f01945' 
  AND token = 'we0fpKbXZiUUE2M4sP2o1u+ydTstN5Cla1bmcxWw43Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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