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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11058c0f9e8e798ceaebd20a4092c35d01a7f6783af2c81c659d83f9159bcb8a' 
  AND token = 'XxlJ4xm9Ejmk/GfqAt4tgchtqS5dC692aSBMs1xEfCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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