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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4bd57fbce8fd92fcc80a9e021417d6341f5ca99c698e2ebf9782c69a3222e7' 
  AND token = 'Ry7Gheg/ZJlO+MG77HjqI7cze7ez0FCDjwL4qDfvX9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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