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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2b56112ccb3d92bf643a044fec524b586137f6e2e6118e29eec428fc592bf4' 
  AND token = 'u1v41G1VW+ipSmWxtBDrLvbw7hJA9LslYm7WYlORQQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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