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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ba568eb0b9213814f5d5c7bedaeda61965be7a6b2bba075f4a0b4865e5b18a' 
  AND token = 'R99bCSrp9CtASeYmkUfYWy5x9I+f0iJexN6Ch6lKdVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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