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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4191aa10d1bf228480c6d2d23f42092b6750ed4e0b157a8f1f51ddea43502564' 
  AND token = '6eH+qIyfSAyU2xdZD6CJt73Sl44+Q3xR5HKKWSRnCu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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