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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a94ab7b1512675814b2ac60624b831dc373638fe1a8771931516547b38577ef' 
  AND token = 'GYe7PdNRr7qDoAhizHc1NOB6UbJLIi3ajvAYmxzY2Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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