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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031aa5c0eb533513f81cddcb66caa33e5324b9b8b78f1aab027a3fac2e51a46a' 
  AND token = 'kT3VfdilnzNonNEqOHMwgQ4ag+rfVAUCIFcdDIjy1d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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