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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ff3dbbe3a3ebda6a2ac143fba9511fafce45c29f46061d4ee27c2934d409b5' 
  AND token = 'uueyXcBxn5ON6K8ck6zTpyZCrqCUmuikUuj/nAE1eY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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