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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8554ade1b145182c23285fd456532f7d3de89576ce6c6c6d6bc88d01991136' 
  AND token = '4yH7D1ffeFBd9V7Qiv+3U0UK4cLzeptJrQODaryk2cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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