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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b55435e2dde41a03872aa2b8e08492b69ac67f347a13b762bba1005c103a64' 
  AND token = '5/wQPfLT32WFaw6TVREdn2C3fsbO/157AJ+X4tB809w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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