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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a59571a33e2bbdfbd467bd535f50998633ae3efc36548c49b661bf6e80d228' 
  AND token = 'znXQCANIQ0uKevO8LKqqELfk1CHJXMk47VrP3aWGZVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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