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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adba548491908a44ae990be25784203de310fa30a220f6e6f92fa5ac7e61adb1' 
  AND token = 'AFaHfXVjPKAJIBVPUJGkM8YaQW1OLYuunkMc+OUNcv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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