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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2a4c22bf92ee810d356e0cde7497b4abc12d717bce34da9af663ddc2f3d050' 
  AND token = 'Uvw3f71Vl+dL0C6fn4lkOZ3jQriZK8JSkDILvJOm7e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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