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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cf78f9c4c2a77f9537a07c4c518f6346b95e460218cec293623f439337895a' 
  AND token = 'fy258RWTU+e1E5um6z+X9BviX6oD0Jio/WkoYPGH3sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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