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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb279d25d95a9d6b9432369ba84b30167409b0abcaf2441414d643643f0eaa01' 
  AND token = '3xFcJDM9GE+f0Tv9+LOR0RJC5Hqww+O4rK1wIaBdOrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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