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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642ac6a6d40b9c7eec4311627e376eacb5201cdcfc2bfb94eb2716a99ae2dbd4' 
  AND token = 'K2SkrPclyZ4DcD8y8hbZ8Uc4VxGuQslpJm5H0LT39/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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