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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1751e11c2190e86dd0baca5b3c4beec46cdf86b5427118f84a20c73118e27ed9' 
  AND token = '1NXmy6ysqTLxR12iIFD/+/5LuK4091S1CxGXq1OlH6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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