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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d087d0fe62c7acb3f31b343fa7d41d30422730574368a7d0132b6ab40cceb8' 
  AND token = 'oHJe9xPtbgBfWT/2lI5pRUZ1q1jCJf2mpWdAEk+4IrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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