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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbd999cd9c8600f9c539d1374382e9e2b81b00756f33773f23d4f3492259f90' 
  AND token = '8X8B8JZR0d3suz1PXerEJFlzOmxnVMNbX5rGdQahayg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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