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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2074599760fd3ddd7f5b37433b2d02f1fb80d672fb004db92af19c85f79fbe' 
  AND token = 'cNGJEGs0eyAq3zYdbmymfS5/b1pVtclMIy/FKs3OcCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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