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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd4262ef4ef6fe0d0f083fc2c7f4e7763ab1dbef7e8ecff917526041569a822' 
  AND token = 'aiYiHIN078f57y2u4RWXtJ0KCUqgmlblQ6+7YuN1wBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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