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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5daa91696c3b27709685d5dde2f8e7f62492185770e899e1f655486720af8e16' 
  AND token = 'F51ai1rVvgOkePPAbzXDzD33HQpRS8B1kFJ4upr77jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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