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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783c8fd7c83a762edec0eb6a5032238d1738b57ffcf163b8f5bbd2ae27d2010f' 
  AND token = 'cTpMDTh+gA48W41lKHyaFnzNN0R1au1l5ZElxR+ze7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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